Dear Racketeers,

Is there something I have misunderstood about vectors, boxes and places which 
might explain why immutable boxes are not place-message-allowed, but immutable 
vectors are?

> (place-message-allowed? (box-immutable #f))
#f
> (place-message-allowed? (vector-immutable #f))
#t
> 

c.f.

https://docs.racket-lang.org/reference/boxes.html 
<https://docs.racket-lang.org/reference/boxes.html> 

A  <>box is like a single-element vector, normally used as minimal mutable 
storage.

Best,

Tim

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